It looks like developers were just another group used by FB for their own purpose, when convenient. In this case, developers were the "growth hack" doing a big

It looks like developers were just another group used by FB for their own purpose, when convenient. In this case, developers were the "growth hack" doing a big part of the legwork of increasing FB's value and stickiness to end-users, themselves used in order to sell data to the customers (advertisers). Rememeber when Zynga's stock was used as a proxy for FB as they were the first to go public? Now that FB the ad broker is big enough, they don't need to care about developers and only need to give the illusion that they care about the users.